1 /*****************************************************************************
2 *
3 * mtdev - Multitouch Protocol Translation Library (MIT license)
4 *
5 * Copyright (C) 2010 Henrik Rydberg <rydberg@euromail.se>
6 * Copyright (C) 2010 Canonical Ltd.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the next
16 * paragraph) shall be included in all copies or substantial portions of the
17 * Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
24 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25 * DEALINGS IN THE SOFTWARE.
26 *
27 ****************************************************************************/
28
29 #ifndef MTDEV_EVBUF_H
30 #define MTDEV_EVBUF_H
31
32 #include "common.h"
33
34 struct mtdev_evbuf {
35 int head;
36 int tail;
37 struct input_event buffer[DIM_EVENTS];
38 };
39
evbuf_empty(const struct mtdev_evbuf * evbuf)40 static inline int evbuf_empty(const struct mtdev_evbuf *evbuf)
41 {
42 return evbuf->head == evbuf->tail;
43 }
44
evbuf_put(struct mtdev_evbuf * evbuf,const struct input_event * ev)45 static inline void evbuf_put(struct mtdev_evbuf *evbuf,
46 const struct input_event *ev)
47 {
48 evbuf->buffer[evbuf->head++] = *ev;
49 evbuf->head &= DIM_EVENTS - 1;
50 }
51
evbuf_get(struct mtdev_evbuf * evbuf,struct input_event * ev)52 static inline void evbuf_get(struct mtdev_evbuf *evbuf,
53 struct input_event *ev)
54 {
55 *ev = evbuf->buffer[evbuf->tail++];
56 evbuf->tail &= DIM_EVENTS - 1;
57 }
58
59 #endif
60